期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 2, 期 10, 页码 3109-3120出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.0c00433
关键词
nanowire; graphene; oxygen plasma; GaAsSb; molecular beam epitaxy; photodetector
资金
- Office of Naval Research [N00014-16-1-2720]
- National Science Foundation [ECCS-1542174, ECCS-1542015]
- State of North Carolina
We report the growth of vertical, high-quality GaAs(0.9)Sb(0.1 )nanowires (NWs) with improved density on oxygen (O-2) plasma-treated monolayer graphene/SiO2/p-Si(111) by self-catalyzed molecular beam epitaxy. An O-2 plasma treatment of the graphene under mild conditions enabled modification of the surface functionalization and improved reactivity of the graphene surface to semiconductor adatoms. The rise in the disorder peak of the Raman mode, decreased surface conductivity, and creation of additional O-2 groups of plasma-treated graphene compared to that of pristine graphene confirmed functionalization of the graphene. To enhance the nucleation centers further for the vertical yield of NWs on the graphene surface, NWs were grown on a higher Sb composition GaAs(0.6)Sb(0.4 )stem for surface engineering the graphene surface via the surfactant effect of Sb and for better lattice matching. The NWs grown under optimal conditions exhibited a zinc blende crystal structure with no discernible structural defects. The NWs with a GaAs-passivated shell exhibited photoluminescence emission at 1.35 eV at 4 K and 1.28 eV at room temperature. The ensemble device fabricated with a top segment of GaAsSb NW-doped n-type using a GaTe captive source exhibited an optical responsivity of 110 A/W with a detectivity of 1.1 x 10(14) Jones. These results of hybrid GaAsSb NW heterostructure/graphene devices show significant potential toward the fabrication of flexible near-infrared photodetector device applications. Further, the simple and efficient O-2 plasma treatment approach for surface engineering of graphene in conjunction with a high Sb compositional stem has shown to be a promising route that can be broadly applicable for the growth of other III-V ternary material systems for improving the vertical yield of NWs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据